Thread cutting mechanism for double shuttle looms



1931. R. G. TURNER 1,817,112

THREAD CUTTING MECHANISM FOR DOUBLE SHUTTLE LOOMS Filed March so, 1929 sSHeets-Sheet 1.

, Q jP/cfiom 6 72/070" Alig. 4, 1931 R, TURNER 1,817,112

THREAD CUTTING MECHANISM FOR DOUBLE SHUTTLE LOOMS 5 Sheets-Sheet 2 FiledMarch 30, 1929 [We/ra or jg ahva Zm "Wm *M I F55 TD Aug. 4, 1931 R. G.TURNER 7,

THREAD CUTTING MECHANISM FOR DOUBLE SHUTTLE LOOMS Filed March 30, 1929 3Sheets-Sheet 3 6/ [We/21 0f IZMa/c/ Zmer Patented Aug. 4, 1931 UNITEDSTATES PATENT OFFICE RICHARD G. TURNER, OF WORCESTER, MASSACHUSETTS,ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS,A CORPORATION OF MASSACHUSETTS THREAD CUTTING MECHANISM FOR DOUBLESHUTTLE LOOMS Application filed March 30, 1929.

This invention relates to a weft replenishing loom in which a doubleshed is provided and in which a separate shuttle is operated in eachshed.

v It it the object of my invention to provide selective thread cuttingmechanism for such a loom, so designed that the outgoing weft in eitherthe upper or lower shuttle may be eflectively severed upon ejection of aweft carrier from said shuttle.

' Another object of the invention is to provide a thread cuttingmechanism comprising a separate thread cutting device for each of theupper and lower shuttles, together 5 with selective actuating mechanismthere for, and means for separately adjusting the setting thereof.

A further feature of the invention relates to the provision of a threadcutter mounted .20 on the lay and so constructed that it will beprojected forward toward the weft as the blades are closed to sever thethread.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form is shown in the drawings in which I v Fig. 1 is a planview of parts of a loom embodying my improvements;

Fig. 2 is a sectional end elevation, taken along the line 22 in Fig. 1;

Fig. 3 is a side elevation, partly insection, of my improved threadcutting devices;

Fig. 4 is a view similar to Fig. 8, but showing the parts in adifferentposition;

Figs. 5 and 6 are detail sectional plan views, taken along the lines 5-5and 66 in Fig. 4 respectively;

Fig. 7 is a detail sectional elevation, taken along the line 7'. in Fig.2, and Fig. 8is a detail section, taken along the line 8-8 in Fi 4.

Referring to the drawings, I have shown 2* portions of a double shuttleloomincluding a lay 10 mounted on swords 11 in a loom frame 12. A reed13 is secured in place on the lay 10 by the usual hand rail or clamp 14.A vertical stationary magazine 20 mounted on the breast beam 22 and apair of trans- Serial No. 351,297.

ferrers 24 and 26 are slid-ably mounted in a stand 28 in front of themagazine 20.

The transferrcrs 24 and 26 are actuated by levers 30 and 31 (Fig. 1) bywhich they are selectively moved rearward upon indication of weftexhaustion and thereby transfer weft carriers to the upper and lowershuttles respectively.

For a more complete description of the magazine and transfer mechanism,reference is made to my prior application, Serial No. 300,279, filedAugust 17, 1928.

The present application relates more particularly to the mechanism whichI have provided for cutting the outgoing weft as a bobbin is ejectedfrom the upper shuttle S or from the lower shuttle S My improved threadcutting devices are mounted on a pair of supporting plates and 42 (Fig.3) clamped in vertical parallel relation on a bar 43 1) secured to anupward projection of the sword 11.

The thread cutter for the lower shuttle comprises a cutting member orblade 45 (Fig. 3) pivoted at 46 to the frame 40. A second cutting member48 is pivotally connected by a stud 49 to an intermediate point in thelength of the cutting member 45. The member 48 is also provided with astud 50 extending loosely through a vertical slot 51 in the supportingplate 40. A spring 52 is connected at its upper end to an offset portion53 of the plate 40 and at its lower end to the upper end of the cuttingmember 48.

A U-shaped spring clamp (Fig. embraces the cutting members 45 and 48 andis held in position by the stud. 49 which extends through openings inthe ends of the clamp 55. The clamp serves to press the cutting men1bers 45 and 48 yieldingly together, thus assuring effective cuttingaction.

A pull wire is attached to the upper end of the cutting member 48 andextends through a. tubing 62 along a circuitous path to a bracket 64(Fig. 2) secured to the front of the breast beam 22. The tubing (52 issecured in the bracket 64 by a. clamp (36 and clamping screw 67 (Fig.7). The end of the pull wire 60 is secured to a screw 68 (Fig. 1) fixedin the end of the transfer actuating lever 31.

Lil

The second end of the tubing 62 is anchored at 69 (Fig. 3) in the standor plate 10.

As the lever 31 moves rearward to transfer a bobbin, the wire 60 will bepulled downward in the portion shown in Fig. 3 and the cutting members45 and 48 will be moved from the position shown in Fig. 3 to that shownin Fig. l. During this movement, it will be noted that the cuttingblades are not only closed with a scissor action, but that they are alsoprojected forward in front of the reed 13 and to a position to grasp andsever the out-going weft.

The construction and operation .of the second pair of cutting blades 70and 71 for the upper shuttle S is substantially identical withtheconstruction previously described. A second pull wire 72 is providedfor the blade 71 and is guided through a second tube M anchored at oneend to the plate 42 and at the other end to the bracket 6% by a clamp 75and screw 7 6. (Fig. 7)

The effective length of the pull wires 60 or 72 may be readily adjustedby inserting or withdrawing the tubes 62 or 7 1 in the bracket 64. If atube is drawn forward relative to the bracket 64:, the effectivedistance measured along the tubing from the bracket 64 to the anchoragein the plate 40 or {l2 will be increased and the effective length of thewires 60 ,or 72 will be correspondingly decreased. This method ofadjustment is more conven-' ient than the actual lengthening or shortening of the wires at their points of attachment to the transferrer leversor to the cutting members. Y

Having described the details 'of c'onstruction of my invention, itwillbe seen that I have provided simple and effective thread cuttingmechanism for a double shuttle loom by which the outgoing weft in eithershuttle may be effectively severed whenever that particular shuttle isto be replenished. The thread cutters are normally withdrawn rear wardof the plane of the front edges of the reed 1-3 but are moved forwardand downward to grasp and sever the thread during the cutting operation.The thread cutters are operated only upon actual ejection of aweftcarrier, being directly connected to the 11'lCl11-- nism by whichthe transfer is effected.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, other wise than asset forth in the claims, but what I claim is v 1. In a weft replenishingloom, a pair of shuttles operable in superposed paths between the sameterminal limits, a single sta-. tionary magazine for replenishing saidtwo shuttles, separate means to transfer a weft carrier horizontallyfrom said magazine to the upper or to the lower shuttle, separate butclosely associated devices for severing the out-going weft for eachshuttle on weft ejection, said separate devices being mounted on the layand being normally positioned rearward of the paths of the shuttles andeach device being effective to sever the weft outside of'the exhaustedshuttle, and separately controlled operating means for advancing andactuating each severing device upon transfer to the correspondingshuttle.

2. Inaweftreplenishing loom, apair ofshuttles operable in superposedpaths between the same terminal limits, a single stationary ma gazinefor replenishing said two shuttles, separate means to transfer a weftcarrier to each shuttle, and separate. but closely associated severingdevices mounted on the lay and at different elevations above the lay,each severing device being associated with one ofjsaid transfer meansand being effective to sever the out-going weft for the associatedshuttle at weft ejection, said transfer means and said associatedsevering device being operated substantially simultaneously for eachshuttle and thcweft being severed outside of the 8X- hausted shuttle. I

3. In a weft replenishing loom, a pairof shuttles operable in superposedpaths, aseparate transferrer'for each shuttle, a thread cutter for theoutgoing weft in each shuttle mounted outside of and independent of theshuttle, and a direct operating connection from each transferrer to itsassociated thread cutter whereby the thread is severed outside of theoutgoing shuttle.

4. In a weft replenishing loom, a pair of shuttles operable insuperposed paths, a transferrerfor each shuttle, athread cutter for theoutgoing weft in each shuttle, a wire directly connecting each threadcutter to its associated transferrer, a tubing in which each wire isslidable, and supports in which the ends of said tubing aresecuredadjacent said thread cutter and said transferrer respectively.

5; Thecombination ina loom as set forth in claim 4, in which provisionis made for adjustably securing one end of each tubing in its support,whereby the effective length of the wire between a transferrer and itsassociated thread cutter may be variably determined. I V

6. In a loom, a lay, a stand on said lay, athread cutting blade pivotedat one end to said stand, a second blade having a floating. pivotalconnection to said first bladeand having a stud and slot connection withsaid stand, means topositively close said blades with a cutting action,and a spring to yieldinglyrestore said blades to inoperative openposition.

fixed my signature.

In testimony whereof I have hereunto afits

